- 1st Edition AD&D DMG, 4th edition DMG (tied)
- Holmes Blue Book (yeah it got the player stuff in it too)
- 3rd Edition, (gets a nudge over 2nd edition because of the NPCs Classes)
- 2nd Edition
4th edition DMG breaks with this and returns to 1st Edition and the Blue Book example of actually teaching the referee something. The 4 edition DMG gets a A+ for it's advice on running the game and handling players, it gets a A+ for having an actual mini-setting and a complete town.
It get an solid A for exposing the math behind everything in 4e and explaining it in a way that a person doesn't have a degree in Star Fleet Battle, a masters in Advanced Squad Leader, and a doctoral in Hero System can understand. Of course they get critized for doing that by people saying that how the game must be played. I found those chapters a useful tool for fine-tuning my 4e NPCs and encounters.
However the weak Dungeon gets a resounding D- and Wizards gets a D- for ignoring nearly every example in their own DMG except for that one Dungeon.
However to be fair, it looks like Wizard's is recognizing the issue. We will see what next year brings.